Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d8ba8b1575c54a…

MALICIOUS

PDF

68.2 KB Created: 2020-11-17 22:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ad2b197546022211e85a56a6b7f24cf8 SHA-1: 79179244d0a9f78f38ff3bc9cbe659028d89a3ab SHA-256: 37d8ba8b1575c54a15a7d84b99651eb74ac45e01e4a9fa7369c9ea48d5c8f44d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which is not inherently malicious but can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/123?utm_term=mega+man+11+all+boss+weaknesses In PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/pozagape_kiwav_wuniguwan_nejogiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5fa5c3903bdf1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/74538868-0c5d-40b1-87af-4bb3c97422d7/gta_san_andreas_xbox_controls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b154a052-7e3a-444b-8b6c-5e9dbff630e1/datodupuraxabobupilituxow.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/mindy_kaling_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e6d9825-9ab9-4392-9d8c-4a3ca9106d98/ganuvuwezopew.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/kadunanawarerififix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de096815-fb93-4db8-a21b-1b9b5607973a/xifamolawunewixawutiluvus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd705414-6f6b-438d-8ba2-331b4e0ad8d1/zen_shorts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84663036-2d76-4372-9e18-76cbd3b2af84/oxford_dictionary_of_construction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d87f4b14-7fd2-47a9-82bf-afcdffd441fe/21550683547.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF24 5260 bytes
SHA-256: 61543a51cfcec2da70fc1cba513892812fc0567de1fc17e7952e932f5830222a
font_01_sfnt_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 10132 bytes
SHA-256: a018608791f8a14534b9ac43127f497944c04a93bb26e4220fd966540f392bb2

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